wetzer



(No Model.)

H WETZER SIGNALING APPARATUS.

No. 496,076. Patented Apr. 25, 1 893.

ETERS 60.. vuoroumm WASHINGTON. n. c.

UNITED STATES PATENT OFFICE.

HERMANN WETZER, OF PFRONTEN, GERMANY.

SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 496,076, dated April25, 1893. Application filed August 8, 1892. Serial No. 4 21 2 N 1 11 ToaZZ whom it may concern.-

Be it known that I, HERMANN WETZER, a subject of the King of Bavaria,Empire of Germany, residing at Pfronten, Bavaria, Germany, have inventedcertain new and useful Improvements in Signaling Apparatus for Telegraphor Telephone Systems, of which the following isa specification.

This invention, as its title indicates, relates to devices whereby theoperator at one station of a telephone or telegraph or similar systemmay signal to or call up any station on the line in which his station islocated.

The invention more particularly relates to systems employing pendulumsof varying length (one for each station) for actuating the signalingdevices.

The purpose of my invention, is to provide means whereby the pendulumsin the system are positively actuated by a constant force exerted, e.g., by a hammer in response to the operator at the calling-u p stationand are rapidly and positively stopped when the signaling ceases andpositively held'or arrested in their condition of rest.

It is also the purpose of my invention, to enable the operator to closean alarm circuit at the called-up station and thereby tocause acontinual alarm tobe given, which will not cease until the operator atthe called-up station breaks the said alarm circuit.

For these purposes, my invention consists in the devices, features andcombinations of parts to be hereinafter described and pointed out in theclaims.

In the accompanying drawings,Figure 1 represents, in diagram, asignaling apparatus embodying my invention; Fig. 2, a similar view of asomewhat modified apparatus; Figs. 3, 4t and 5, detail views of certainparts of the apparatus, somewhat modified.

Each station to be called up is provided with a pendulum, P, eachpendulum being of a difierent length and hence having different times ofoscillation. Each pendulum, P, is provided with a pendulum-stoppreferablyin a lateral arm, a, Figs. 1 and 2, upon which, when the lineis at rest, rests the arm or hammer, 'v, of the armature-lever A,pivoted at 0 (Fig. 1) or the hammer H (Fig. 2), so that the pendulumsare urged a little out of their lowermost position. This pend ulum-stopresults in a rapid cessation of the oscillations of the pendulu ms,caused by a previous telegraphing or signaling.

Each signaling station is provided with a circuit making and breakingdevice, e. g. a pendulum, P; whose oscillations may be varied byadjusting thereon asliding weight, G. WVhen no signaling occurs, all thependulums P and P are at rest, the pendulums, P, being crowded out oftheir condition of equilibrium by the key If. The said pendulum, P, ispro vided with a contact, 70, which, when the pendulum, P, oscillates,alternately touches and leaves the spring F. (Figs. 1 and 2.) Inconstant current circuits employing relays, the parts it and F areconnected with the circuits L, as represented in Figs. 1 and 2. When astation is to be called up, the signaling station adjusts the weight Gof its pendulum P, so that its time of oscillation is about the same asthat of the pendulum, P, of the station to be called up, where upon itis caused to oscillate by pressing upon the key, 1?. When pendulum, P,has almost attained its lowermost position, the contact, it, leaves thespring, F, and the circuit is broken. The relays, R, of all the stationshence close the circuit of their local batteries, B, and allarmatures-levers, A, are attracted by the electro-magnets, E. Thependulum stops are hence released and the pendulums, P, are therebyliberated from the lever-arms,o,resting upon their lateral arms, a(Fig. 1) and swing slightly in the direction toward, A,pendulum,]f,completing its first oscillation. On the second or return-oscillation,the pendulum,P, as soon as it has passed its lowest position, againcloses the circuit by the parts and F. This causes the armature-levers,A, to drop and the arms, or hammers, 1;, thereof to strike the lateralarms, a, of all the pendulums P. This stroke upon the lateral arms givesan impulse to the pendulums, P. Pendulum, P, now completes its secondoscillation. When it has again attained its lowermost position in itsthird oscillation,the contact, k, again leaves the spring F, the circuitis again broken, all the armatures are again attracted by theirelectro-magnets, and the arms 1) rise, that is to say, thependulum-stops are released. When pendulum, P, in its fourth oscillationagain attains its lowest position, the springs, F, again close thecircuits with k and the lever-arms, v, areagain drawn downward by thesprings, n. \Vhile the stroke of the armature-lever for those pendulums,P,which oscillate considerably faster than P occurs too late to impingeagainst the lateral arms, a, of the pendulums P the said stroke for thependulums oscillating considerably more slowly occurs either too soontoimpinge against the lateral arms, a, or they are struck, While thependulu ms are still swinging in the direction of A, whereby thesependnlumsare stopped. Only that pendulum, P, which oscillates about asfast as the pendulum,P',receives an impulse from the stroke of o. Thereturn of this pendulum, P, is made free by the fifth oscillation of P,while the sixth oscillation of, P, imparts another impulse thereto, &C-The pendulum,P, thus soon acquires a suflicient amplitude of oscillationto cause a part thereof to strike a contact piece or pin, 0, lying inthe path of such part, thereby closing the circuit of a continuouselectric bell or alarm. This bell will continue to ring, until theemploy called up, stops the alarm. The arrangement may also be such thatthe pendulum rod, when it has acquired a sufficient oscillation, or apin or hook,b,will becaught or arrested by the contact part, c,which,-in this case, is in the form of a spring-hook or catch. Thependulum, P, will then be arrested in the position indicated in dottedlines in Figs. 1 and 2. When the pendulum is in this position, thecurrent of an electric bell or other alarm,S,is closed and the currentnow passes from the local battery, 13, through the alarm, S, through thebinding-post 1, pendulum, P, spring-catcl1,c, returning to the battery,B, by way of binding-post 2. The alarm will sound or operate, until theemploy called up, re-

leases the pendulum, P, from the spring, 0. The contact for the bell oralarm might, moreover, be produced, by causing the pendulum, P, to forcea lever or spring beneath a latch, when it has attained a sufficientamplitude of oscillation, whereby an alarm-circuit is closed until thelever or spring is released by the employ called up. The pendulum mayalso receive its impulse in the following manner, that is to say, thependulum, P, Fig. 2, breaks and closes the circuit, L, in the mannerdescribed thereby closing and breaking the local-circuits at all thestations, by virtue of the relays, R. At each station the armature-leverA, (Fig. 2) whose fulcrum is at 0, whenattracted, presses one arm ofhammer, H, beneath the toe of the spring-latch, f. On the return of thearmature-lever, a stud, e, attached thereto, strikes against the arm, g,of the latch, whereby the hammer, H, is released therefrom and acts uponthe lateral arm, a, in the same manner as the hammer o in Fig. 1.

In a constant current circuit omitting the relays, the contactingarrangement may re main the same.- The striking device is that indicatedin Fig. 2, only the fulcrum of the armature is at x instead of ate andthearmature, A, is attracted by the direct action of the line-current.

In circuits employing relays, the current source, B, is closed andbroken by means of the contacts F and is, when the pendulum, P,oscillates, as shown in Fig. 3. The signal is then given as alreadyexplained. The same effect isproduced in circuits without relays, onlythat the armature, A, is then attracted by the direct action of the linecurrent. The signal may be produced moreover, by pendulums, P, whosetime of oscillation is twice as great as that of the pendulum, P, of thestation to be called up. In this case the make and break of the contactare produced by the means indicated in Figs. Land 5. i

From the above it will be noted that the term hammer, is used todesignate the part '0, in Fig. 1, or the part, H, in Fig. 2. Moreover,inasmuch as either of these parts also perform the function ofstopping-the pendulum, they and the parts immediately acting upon themare comprised under the generic designation I claim-- 1.' In a signalingdevice, a series of pendulums of varying times of oscillation, arrangedone at each station to be called up and an adjustable circuit making andbreaking device arranged in the circuit connecting the differentstations, in combination with ahammer for striking against the pendulumto impendulum-stops.

part a positiveimpulse thereto, an armature ifOI' actuating saidhammerand an electromagnet, the circuit of the electro-magnet being opened andclosed by the adjustable circuit making and breaking device,substantially as set forth. I I

2. In a signaling device, a series of pendulums of varying times ofoscillation arranged one at each station, and a pendulum, ar-

ranged in the circuit connecting the stations, whose times ofoscillation are adjustable, in

combination with a hammer, in each station adapted to strike against thependulum, an armature for actuating said hammer, an electro-magnet foreach armature, aspring, as F, and a contact attached to the adjustablependulum, whereby the circuit of the electromagnets are closed andbroken and the hammers are caused to strike against the pendulums atregularintervals,substantially as set forth. r

3. In a signaling-device, a pendulum, adapted to receive its oscillatingimpulses fromthe calling-up station in combination with astop and meansfor releasing the stop from the calling-up station to'arrest thependulum, when no signal is given, substantially as set forth.

4. In a signaling-device, apendulum, adapted to receive its oscillatingimpulses from the calling-up station and provided with a lateral arm, asa, in combination with a hammer,

adapted to rest upon the lateral arm and means for actuating saidhammer, substantially as set forth.

5. In a signaling-device, a pendulum, adapted to receive itsoscillatingimpulses from the calling-up station in combination withacontact-piece, lying in the path of a part attached to said pendulumand an alarm-circuit per-, manently connected with the pendulum and thecontact-piece, whereby the pendulum,

when attaining a sufficient amplitude of oscillation, causes the alarmto operate, substantially as set forth.

6. In a signaling-device, a pendulum, adapted to receive its oscillatingimpulses from the calling-up station in combination with acontact-piece, 0, provided with a hook arranged in the path of a partattached to said pendulum and adapted to arrest the pendulum,

whenit attains a sufficient amplitude of oscillation, and analarrncircuit permanently connected with the pendulum and thecontact-piece, c, substantially as set forth.

7. In a signaling-device, a pendulum, adapted to receive its oscillatingimpulses from the calling-up station and provided with a hook, I), incombination with a contact-piece, 0, provided with a hook, adapted toengage the hook, I), and an alarm-circuit connected with the hook, I),and the contact-piece,c,substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HERMANN WETZER.

Witnesses:

ALBERT WEIOKMANN, KARL MAYER.

